<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>外边距</title>
    <style>
        #d1{
            width: 100px;
            height: 100px;
            border: 1px solid red;
            /* 单独给某一个方向添加外边距 */
            margin-left: 100px;
        }
        #d2{
            width: 100px;
            height: 100px;
            border: 1px solid red;
        }
        span{
            border: 1px solid blue;
        }
        #s1{
            margin-right: 50px;

        }
        #big{
            width: 200px;
            height: 200px;
            background-color: red;
            /* 解决子元素粘连问题 */
            overflow: hidden;
        }
        #big>div{
            width: 50px;
            height: 50px;
            background-color: green;
            margin-left: 100px;
            /* 当元素的上级元素 的上边缘重合时
            给元素添加外边距会会出现粘连显示异常,
            给上级元素添加overflow:hidden解决 */
            margin-top: 100px;
        }
    </style>
</head>
<body>
    <div id="big">
        <div></div>
    </div>
    <span id="s1">span1</span>
    <span id="s2">span2</span>
    <div id="d1" ></div>
    <div id="d2"></div>
</body>
</html>